/* Copyright 203-2115 AtomWare Technology Pty Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * The flowing information must be keep 
 * Aggregation.java
 * wholebasic
 * 2013-6-18下午5:57:34
 * @author 屈甲康
 * QQ285799123
 * mailto:qujiakang@gmail.com
 */

package org.jackysoft.query;

import java.io.Serializable;

import org.jackysoft.util.StringUtils;

public class Aggregation implements Serializable {
	
	
	/**
	 * 
	 */
	private static final long serialVersionUID = -6683979726465765296L;
	public static final String DESC="desc";
	public static final String ASC ="asc";
	
	
	protected String name;
	protected String style=ASC;
	
	
	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	/**
	 * can only be asc or desc
	 * */
	public String getStyle() {
		return style;
	}

	public void setStyle(String style) {
		if(StringUtils.isEmpty(style)){
			this.style = ASC;
		}else{
			if(DESC.equals(style.toLowerCase()) || ASC.equals(style.toLowerCase())){
				this.style = style;
			}else{
				this.style = ASC;
			}
		}
		
	}
	
	public String aggregate(String pf){
		if(StringUtils.isBlank(pf)) return String.format("%s %s",name,style);
		return String.format("%s.%s %s", pf,name,style);
	}
}
